CN116063999B - Oil layer protective agent for drilling fluid and preparation method and application thereof - Google Patents
Oil layer protective agent for drilling fluid and preparation method and application thereof Download PDFInfo
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- CN116063999B CN116063999B CN202210891398.7A CN202210891398A CN116063999B CN 116063999 B CN116063999 B CN 116063999B CN 202210891398 A CN202210891398 A CN 202210891398A CN 116063999 B CN116063999 B CN 116063999B
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- 239000003223 protective agent Substances 0.000 title claims abstract description 61
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- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 9
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- 229940016286 microcrystalline cellulose Drugs 0.000 claims description 7
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 7
- 229940078499 tricalcium phosphate Drugs 0.000 claims description 7
- 229910000391 tricalcium phosphate Inorganic materials 0.000 claims description 7
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- MLUCVPSAIODCQM-UHFFFAOYSA-N crotonaldehyde Natural products CC=CC=O MLUCVPSAIODCQM-UHFFFAOYSA-N 0.000 claims description 5
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- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 4
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- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 claims description 4
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
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Abstract
The invention relates to an oil layer protective agent for drilling fluid, a preparation method and application thereof, wherein the oil layer protective agent for the drilling fluid comprises the following components in percentage by mass as 100 percent: 0.1 to 1.0 percent of anti-caking agent, and 100 percent of polyvinyl alcohol and/or polyvinyl acetal materials. The oil layer protecting agent for drilling fluid can play a role in plugging micro-pores and micro-cracks when an oil layer is drilled at normal temperature; when the temperature reaches the glass transition temperature, the material is changed from a glass state to a high-elastic state, and the material is changed into a flowable state to lose the plugging effect, so that the permeability of the reservoir is recovered, the purpose of protecting the reservoir is achieved, and the construction method of the oil layer protecting agent for the drilling fluid is simple, has relatively low cost and can effectively protect the reservoir.
Description
Technical Field
The invention relates to the technical field of petroleum drilling engineering, in particular to an oil layer protective agent for drilling fluid, and a preparation method and application thereof.
Background
The ultimate goal of drilling and completing a well is to drill the reservoir and form a channel for the flow of oil and gas, establishing a good production relationship for the oil and gas well. Hydrocarbon layer damage will greatly impact the productivity of hydrocarbon wells. Mainly manifested by a decrease in permeability of the hydrocarbon reservoir. The damage to hydrocarbon reservoirs is reduced in the aspect of drilling and completing fluid in the process of drilling and completing, and the yield of hydrocarbon wells is improved.
In recent years, the mechanism of reservoir damage has been studied extensively by scholars at home and abroad, and some acknowledged conclusions have been drawn:
① Solid phase particles in external fluids such as drilling fluid, completion fluid and the like and original loose particles in a reservoir are moved under the action of external force, so that pores and pore throats of the rock are directly blocked;
② The water in the external fluid causes hydration and expansion of clay minerals of the reservoir stratum, so that pores and pore throats become small, and the flow of oil gas is blocked;
③ The external fluid and the fluid in the reservoir generate physical and chemical actions to generate indissolvable inorganic salts and organic matter sediment or form high-viscosity emulsion, so that the pores of the oil reservoir rock are blocked, and the oil gas flow resistance is increased;
④ Filtrate in the external fluid invades the reservoir, causing reservoir wettability reversal, reducing the relative permeability of the oil and gas, and affecting the recovery of crude oil.
The reservoir protection mechanism is that a certain amount of graded particles are added into the drilling and completion fluid, the particles are used for invading the pore throats of the oil layer to cause blockage, so that the permeability of the oil layer is reduced, a shallow layer, namely an inner mud cake, is formed near the surface of the exposed stratum, and a pollution zone with almost zero permeability is formed near the well wall of the oil layer within a few minutes of opening the oil layer. The depth of the polluted belt entering the oil layer is 1-10 cm, and the permeability of the polluted belt is (0-1) multiplied by 10 mu m. The compactness of the shielding layer is enhanced along with the rise of positive pressure difference, and the shielding layer can prevent the drilling fluid from continuously polluting the oil layer, so that the damage to the oil layer caused by the increase of soaking time is eliminated, and the pollution of well cementing slurry to the oil layer is also prevented. After completion, the shielding ring is released, and the permeability of the reservoir is recovered, so that the reservoir is also called temporary blockage, and the aim of effectively protecting the reservoir is fulfilled.
CN103820085A discloses an oil layer protecting agent for drilling fluid and a production method thereof, which are used for solving the problems that the existing oil layer protecting agent cannot be widely used due to the restriction of using conditions such as high preparation cost, high requirement on field application solid control equipment, incompatibility of working fluid and stratum fluid, poor compatibility with hydrocarbon reservoir rock and the like. The disclosed oil layer protective agent for drilling fluid comprises the following components in percentage by weight: 27-35% of industrial water, 1-1.5% of carboxymethyl cellulose, 53-60% of white oil, 5-10% of ammonium salt, 5-10% of fine calcium carbonate and 1-1.5% of defoamer. The disclosed oil layer protective agent for drilling fluid has the function of assisting in reducing water loss under the condition of not affecting the performance of the drilling fluid, free water penetrating into stratum is further reduced, the particle size of the oil layer protective agent can maximize matching degree according to the pore throat characteristics of different stratum hydrocarbon reservoirs, effective blocking is realized, the damage to hydrocarbon reservoirs can be more effectively avoided due to proper oil phase proportion, and the preparation cost is low.
The existing oil layer protective agent applied on site is mainly ultrafine calcium carbonate, the method for recovering the reservoir permeability of the exploited oil layer is acidification, strong acid is used for site construction, the danger is high, and the acidification equipment is complex and needs frequent maintenance.
In view of the above, it is important to develop an oil layer protecting agent for drilling fluid which has a simple construction method, relatively low cost and can effectively protect a reservoir.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an oil layer protecting agent for drilling fluid, a preparation method and application thereof, wherein the oil layer protecting agent for the drilling fluid can play a role in plugging micro-pores and micro-cracks when an oil layer is drilled at normal temperature; when the temperature reaches the glass transition temperature, the material is changed from a glass state to a high-elastic state, and the material is changed into a flowable state to lose the plugging effect, so that the permeability of the reservoir is recovered, the purpose of protecting the reservoir is achieved, and the construction method of the oil layer protecting agent for the drilling fluid is simple, has relatively low cost and can effectively protect the reservoir.
To achieve the purpose, the invention adopts the following technical scheme:
In a first aspect, the present invention provides an oil layer protecting agent for drilling fluid, wherein the oil layer protecting agent for drilling fluid comprises the following components, based on 100% of the total mass of the oil layer protecting agent for drilling fluid:
0.1 to 1.0 percent of anticaking agent
Polyvinyl alcohol and/or polyvinyl acetal material to 100%.
According to the oil layer protecting agent for the drilling fluid, the temperature-sensitive characteristics of polyvinyl alcohol and/or polyvinyl acetal materials are utilized, namely the materials are in a solid state at normal temperature, and the oil layer protecting agent can be used as a plugging material, so that micropores and microcracks can be plugged when an oil layer is drilled; when the temperature reaches the glass transition temperature, the material is changed from a glass state to a high-elasticity state, and the material is changed into a flowable state to lose the plugging effect, so that the permeability of the reservoir is recovered, and the purpose of protecting the reservoir is achieved.
In the invention, the method for recovering the reservoir permeability by the oil layer protective agent is to inject steam or otherwise raise the temperature to enable the plugging material to be in a flowable state so as to lose the plugging effect, and the construction method is simple and has relatively low cost.
In the present invention, the percentage by mass of the anticaking agent is 0.1% -1.0%, for example, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, etc.
Preferably, the oil layer protecting agent for drilling fluid is composed of the following components in percentage by weight based on 100% of the total mass of the oil layer protecting agent for drilling fluid:
0.1 to 1.0 percent of anticaking agent
Polyvinyl alcohol and/or polyvinyl acetal material to 100%.
According to the invention, the oil layer protecting agent for the drilling fluid is composed of an anti-caking agent, a plugging material polyvinyl alcohol and/or a polyvinyl acetal material in a specific proportion, the formula of the oil layer protecting agent for the drilling fluid is simple, the method for recovering the permeability of a reservoir by exploiting an oil layer does not need acidification, strong acid is not used in site construction, the risk is low, the construction mode is simple, and the cost is relatively low.
Preferably, the polyvinyl acetal material comprises any one or a combination of at least two of polyvinyl glyoxal, polyvinyl formal, polyvinyl butyral, polyvinyl mixed aldehyde, polyvinyl furaldehyde, or polyvinyl crotonaldehyde, wherein typical but non-limiting combinations include: a combination of polyvinyl formal and polyvinyl butyral, a combination of polyvinyl butyral, a polyvinyl mixed aldehyde and polyvinyl furfural, a combination of polyvinyl butyral, polyvinyl mixed aldehyde, polyvinyl furfural and polyvinyl crotonaldehyde, a combination of polyvinyl formal, polyvinyl butyral, polyvinyl mixed aldehyde, polyvinyl furfural and polyvinyl crotonaldehyde, and the like.
Preferably, the polyvinyl acetal compound comprises any one or a combination of at least two of polyvinyl formal, polyvinyl conjugated enal or polyvinyl methacrolein-acetaldehyde, wherein typical but non-limiting combinations include: a combination of polyvinyl formal and polyvinyl conjugated enal, a combination of polyvinyl conjugated enal and polyvinyl methacrolein-acetaldehyde, a combination of polyvinyl formal, polyvinyl conjugated enal and polyvinyl methacrolein-acetaldehyde, and the like.
In the present invention, the polyvinyl butyral-acetaldehyde refers to "polyvinyl acetal (crotonaldehyde and acetaldehyde)".
Preferably, the anticaking agent comprises any one or a combination of at least two of potassium ferrocyanide, tricalcium phosphate, silica, or microcrystalline cellulose, wherein typical but non-limiting combinations include: a combination of potassium ferrocyanide and tricalcium phosphate, a combination of tricalcium phosphate, silicon dioxide and microcrystalline cellulose, a combination of potassium ferrocyanide, tricalcium phosphate, silicon dioxide and microcrystalline cellulose, and the like.
Preferably, the anti-caking agent has a fibrous or powdery shape.
Preferably, the oil layer protectant for drilling fluids has a glass transition temperature of 60-180deg.C, such as 70deg.C, 80deg.C, 90deg.C, 100deg.C, 110deg.C, 120deg.C, 130deg.C, 140deg.C, 150deg.C, 160deg.C, 170deg.C, etc.
Preferably, the shape of the oil layer protecting agent for drilling fluid is fibrous or powdery.
Preferably, when the oil layer protecting agent for drilling fluid is in the form of powder, the particle size of the oil layer protecting agent for drilling fluid is 60 to 5000 mesh, for example, 100 mesh, 200 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh, 1400 mesh, 1600 mesh, 1800 mesh, 2000 mesh, 2500 mesh, 3000 mesh, 3500 mesh, 4000 mesh, 4500 mesh, etc.
In a second aspect, the present invention provides a method for preparing the oil layer protecting agent for drilling fluid according to the first aspect, the method comprising the following steps:
Uniformly mixing polyvinyl alcohol and/or polyvinyl acetal materials and an anti-caking agent, and crushing to obtain the oil layer protective agent for drilling fluid.
Preferably, the temperature of the comminution is < 30 ℃, e.g. 25 ℃, 20 ℃, 15 ℃, 10 ℃,5 ℃, etc.
As a preferable technical scheme, the preparation method comprises the following steps:
Uniformly mixing polyvinyl alcohol and/or polyvinyl acetal materials and an anticaking agent, and crushing the mixture at the temperature of less than 30 ℃ to obtain the oil layer protective agent for drilling fluid.
In a third aspect, the present invention provides a drilling fluid comprising the reservoir protecting agent for a drilling fluid of the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the oil layer protecting agent for the drilling fluid, the temperature-sensitive characteristics of polyvinyl alcohol and/or polyvinyl acetal materials are utilized, namely the materials are in a solid state at normal temperature, and the oil layer protecting agent can be used as a plugging material, so that micropores and microcracks can be plugged when an oil layer is drilled; when the temperature reaches the glass transition temperature, the material is changed from a glass state to a high-elasticity state, and the material is changed into a flowable state to lose the plugging effect, so that the permeability of the reservoir is recovered, and the purpose of protecting the reservoir is achieved.
(2) In the invention, the method for recovering the reservoir permeability by the oil layer protective agent is to inject steam or otherwise raise the temperature to enable the plugging material to be in a flowable state so as to lose the plugging effect, and the construction method is simple and has relatively low cost.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides an oil layer protecting agent for drilling fluid, which comprises the following components:
995kg of polyvinyl formal and 5kg of tricalcium phosphate.
The polyvinyl formal is purchased from sea-borne leaf biotechnology limited and has the brand number of S28525.
The glass transition temperature of the oil layer protecting agent for drilling fluid in this example is 132 ℃.
The preparation method of the oil layer protective agent for the drilling fluid comprises the following steps:
uniformly mixing polyvinyl formal and tricalcium phosphate according to the formula amount, and crushing at a low temperature of 10 ℃ until the content of the material with the particle size of 325-400 meshes is 98%, thereby obtaining the oil layer protective agent for the drilling fluid.
Example 2
The embodiment provides an oil layer protecting agent for drilling fluid, which comprises the following components:
500kg of polyvinyl formal, 490kg of polyvinyl butyral and 10kg of microcrystalline cellulose.
The polyvinyl formal is purchased from sigma aldrich (Shanghai) trade company under the trade designation 182680.
The polyvinyl butyral is available from sigma aldrich (Shanghai) trade company under the trade designation P110010.
The microcrystalline cellulose is available from sigma aldrich (Shanghai) trade company under the trade designation Y0002021.
The preparation method of the oil layer protective agent for the drilling fluid comprises the following steps:
Uniformly mixing polyvinyl formal, polyvinyl butyral and microcrystalline cellulose according to the formula, and crushing at a low temperature of 5 ℃ until the content of the material with the particle size of 850-1100 meshes is 98.5%, thereby obtaining the oil layer protective agent for drilling fluid.
Example 3
The embodiment provides an oil layer protecting agent for drilling fluid, which comprises the following components:
1980kg of polyvinyl furaldehyde fiber and 20kg of silicon dioxide.
The polyvinyl furaldehyde fibers were purchased from sigma aldrich (Shanghai) trade limited.
The preparation method of the oil layer protective agent for the drilling fluid comprises the following steps:
and mixing and stirring the polyvinyl furaldehyde fiber and the silicon dioxide until the polyvinyl furaldehyde fiber is in a fluffy state, so as to obtain the oil layer protective agent for the drilling fluid.
Comparative example 1
This comparative example differs from example 1 in that the polyvinyl formal is replaced by an equal mass of ultrafine calcium carbonate, the remainder being the same as example 1.
Performance testing
The drilling fluid reservoir protectants described in examples 1-3 and comparative example 1 were tested as follows:
Referring to sulfonated asphalt standard Q/SY 17095-2016 blocking agent sulfonated asphalt for drilling fluid, the addition amount of an oil layer protecting agent is 2%, the vitrification conversion temperature of the oil layer protecting agent described in example 1 is 132 ℃, and the high-temperature and high-pressure fluid loss of 120 ℃/3.45MPa and 150 ℃/3.45MPa are respectively detected.
And detecting the six-speed viscosity of the base slurry and the sample slurry before and after hot rolling at the room temperature and 150 ℃, and the filter loss in the API and the high-temperature high-pressure filter loss.
TABLE 1 detection results
Note that: the rheological property is detected after ageing for 16 hours at 120 ℃/150 ℃ and cooling to room temperature.
As can be seen from the data in the table, the addition of the oil layer protecting agent has small influence on rheological property of a drilling fluid system, and the high-temperature high-pressure filtration loss of 120 ℃/3.45Mpa is reduced from 75mL of base slurry to 68mL under the detection of the glass transition temperature, so that a certain plugging and filtration loss reducing effect is achieved; and detecting the high-temperature high-pressure filtrate loss of 150 ℃/3.45Mpa above the vitrification conversion temperature, wherein the filtrate loss is increased from 83mL to 85mL because the oil layer protective agent is converted into a free-flowing state, and the oil layer protective agent loses the plugging effect.
The reservoir protectants for drilling fluids described in examples 2-3 were tested in a manner similar to that of example 1:
Wherein the two temperatures for detection of high temperature and high pressure fluid loss were 10℃below and 20℃above the glass transition temperature of the oil layer for drilling fluid, respectively, and as a result, the effects similar to those of example 1 were exhibited.
The oil layer protective agent described in comparative example 1 only has a blocking effect, and its blocking permeability cannot be adjusted by controlling the temperature.
In summary, in the invention, the oil layer protecting agent for drilling fluid utilizes the temperature-sensitive characteristics of polyvinyl alcohol and/or polyvinyl acetal materials, namely the materials are in a solid state at normal temperature, and can play a role in plugging micropores and microcracks when drilling an oil layer; when the temperature reaches the glass transition temperature, the material is changed from a glass state to a high-elasticity state, and the material is changed into a flowable state to lose the plugging effect, so that the permeability of the reservoir is recovered, and the purpose of protecting the reservoir is achieved. The method for recovering the reservoir permeability by the oil layer protective agent is to inject steam or otherwise raise the temperature to enable the plugging material to be in a flowable state so as to lose the plugging effect, and the construction method is simple and has relatively low cost.
Analysis of comparative example 1 and example 1 shows that comparative example 1 has inferior performance to example 1, demonstrating that the oil layer protectant for drilling fluids of the invention has better performance than prior art ultrafine calcium carbonate as oil layer protectant for drilling fluids.
The present invention is described in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e., it does not mean that the present invention must be practiced depending on the above detailed methods. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (9)
1. A method for recovering the permeability of a reservoir by using an oil layer protective agent for drilling fluid, which is characterized in that the oil layer protective agent for the drilling fluid comprises the following components in percentage by mass based on 100 percent of the total mass of the oil layer protective agent for the drilling fluid:
0.1 to 1.0 percent of anticaking agent
Polyvinyl acetal material to 100%;
the polyvinyl acetal material is any one or a combination of at least two of polyvinyl glyoxal, polyvinyl formal, polyvinyl butyral, polyvinyl mixed aldehyde, polyvinyl furfural or polyvinyl crotonaldehyde;
The anticaking agent is any one or the combination of at least two of potassium ferrocyanide, tricalcium phosphate, silicon dioxide or microcrystalline cellulose;
The method for recovering the permeability of the reservoir by using the oil layer protective agent for the drilling fluid comprises the steps of increasing the temperature in a steam injection mode, and converting the glass state of a material into a high-elastic state after the temperature reaches the glass transition temperature, so that the plugging effect is lost, and the permeability of the reservoir is recovered.
2. The method of recovering reservoir permeability with an oil layer protectant for a drilling fluid of claim 1, wherein the polyvinyl acetal compound comprises any one or a combination of at least two of polyvinyl formal, polyvinyl acetal conjugated enal, or polyvinyl acetal-aldehyde.
3. The method for recovering reservoir permeability using an oil layer protectant for a drilling fluid according to claim 1, wherein the anti-caking agent has a fibrous or powdery shape.
4. The method for recovering reservoir permeability using an oil layer protectant for a drilling fluid according to claim 1, wherein the glass transition temperature of the oil layer protectant for a drilling fluid is 60-180 ℃.
5. The method for recovering reservoir permeability using an oil layer protectant for a drilling fluid according to claim 1, wherein the shape of the oil layer protectant for a drilling fluid is fibrous or powdery.
6. The method for recovering reservoir permeability of an oil layer protectant for a drilling fluid according to claim 5, wherein when the oil layer protectant for a drilling fluid is in the form of powder, the particle size of the oil layer protectant for a drilling fluid is 60-5000 mesh.
7. The method for recovering reservoir permeability by using the oil layer protectant for drilling fluid according to claim 1, wherein the method for preparing the oil layer protectant for drilling fluid comprises the following steps:
Uniformly mixing the polyvinyl acetal material and the anticaking agent, and crushing to obtain the oil layer protective agent for the drilling fluid.
8. The method of recovering reservoir permeability with an oil layer protectant for a drilling fluid of claim 7, wherein said comminuting temperature is less than 30 ℃.
9. The method for recovering reservoir permeability using an oil layer protectant for a drilling fluid according to claim 7, wherein the method for preparing the oil layer protectant for a drilling fluid comprises the steps of:
Uniformly mixing the polyvinyl acetal material and the anticaking agent, and crushing the mixture at the temperature of less than 30 ℃ to obtain the oil layer protective agent for the drilling fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891398.7A CN116063999B (en) | 2022-07-27 | Oil layer protective agent for drilling fluid and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891398.7A CN116063999B (en) | 2022-07-27 | Oil layer protective agent for drilling fluid and preparation method and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116063999A CN116063999A (en) | 2023-05-05 |
| CN116063999B true CN116063999B (en) | 2024-07-05 |
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| CN106566484A (en) * | 2016-10-31 | 2017-04-19 | 中国石油大学(华东) | Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106554763A (en) * | 2015-09-24 | 2017-04-05 | 中国石油化工股份有限公司 | A kind of blocking agent and its preparation method and application |
| CN106566484A (en) * | 2016-10-31 | 2017-04-19 | 中国石油大学(华东) | Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof |
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